Experimental investigation on the confining effect of fibers in SHFRCC

Georgiou, Antroula; Pantazopoulou, Stavroula J.

doi:10.1016/j.compstruct.2017.09.110

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…To avoid any uncertainties associated with the bond strength, 𝜏 , Georgiou and Pantazopoulou [31] measured the internal confining pressure experimentally, 𝜎 , , and confirmed the above theoretical finding, i.e., they found it approximately the same as the tensile strength of SHCC, 𝑓 , . This is also consistent with the French National addition to Eurocode 2 [4], related to the design of fibre-reinforced concrete, which recognizes explicitly the presence of an intrinsic confining pressure, and sets it conservatively equal to 0.8𝑓 , .…”

Section: Experimental Methodologysupporting

confidence: 56%

“…As a starting point, the relationship between the octahedral stresses which was calibrated for normal concrete (Equation ( 1)) was considered and correlated with the available experimental database for SHCC developed for the needs of the present work. All the material characterization tests conducted by the authors [27,31,39] were included in the calibration along with the push-off results of this study, to increase the range of the testbed supporting the derivation of the failure criterion. In total, a collection of results from more than 60 experiments were used, which included: uniaxial tension, uniaxial compression, splitting, push-off, and confined cylinders in compression with the use of carbon and glass FRP jackets in various layers.…”

Section: Discussion: a Three-parameter Failure Criterion For Shccmentioning

confidence: 99%

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Shear Strength of Strain-Hardening Cementitious Materials

Georgiou,

Eshghi,

Pantazopoulou

2023

Construction Materials

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Concrete and other semi-brittle materials are pressure sensitive. Their resistance to shear depends on the confining pressure acting normal to the shear plane. This behaviour is modelled using experimentally calibrated failure criteria, such as the Mohr–Coulomb failure surface. Pressure sensitivity is also strongly evident in fibre-reinforced, strain-hardening cementitious composites (SHCC), despite the internal confinement these materials possess on account of their fibre content. However, because of the great range and variety of mixes used in such materials, no general failure criteria have yet been proposed. In this paper, the pressure-sensitive shear strength of SHCC containing short discontinuous PVA fibres is modelled with a three-parameter failure criterion. The parameters of the criterion are calibrated to the experimental results obtained from several tests that combine shear and normal pressure. These include uniaxial tension and compression, split tests, triaxial compression, and a series of push-off tests with and without reinforcement crossing the shear sliding plane. The calibration of the failure criterion explicitly accounted for the magnitude of internal confinement which is generated in the cementitious matrix in response to fibre tension. The criterion is appropriate for general purpose analysis of the stress state of SHCC, but most importantly it is used to assess the SHCC contribution to the shear strength of structural elements.

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Section: Experimental Methodologysupporting

confidence: 56%

Section: Discussion: a Three-parameter Failure Criterion For Shccmentioning

confidence: 99%

Shear Strength of Strain-Hardening Cementitious Materials

Georgiou,

Eshghi,

Pantazopoulou

2023

Construction Materials

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“…The strain hardening behavior was extrapolated to the indirect tensile tests of split cylinder and four-point bending that also exhibited multiple cracking, large deformation capacity, increase of strength after first cracking and high energy dissipation. Additionally, in the uniaxial compression tests, failure was delayed with a shift of strain at peak load, and low lateral 114 Engineered Materials for Sustainable Structures deformations, due to the confinement action of the fibers bridging vertical cracks; this is typical of strain hardening fiber reinforced cementitious composites [35]. Part C: Evaluation of the compressive strength of jacketed historic concrete columns Cylinders measuring 150x300 mm, consisting of an internal core of LSC with dimensions 100x300 mm and 25 mm ECC cover, were tested under displacement-controlled compression, with the load applied on the entire cross section.…”

Section: Resultsmentioning

confidence: 99%

Engineered Cementitious Composites for the Conservation of 20<sup>th</sup> Century Concrete Architectural Heritage

Georgiou

Theodoulides

Ioannou

2022

KEM

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Architectural heritage nowadays includes concrete structures constructed in the 20th century. These buildings are usually under-detailed, since the actual behavior of reinforced concrete at the time of their construction was not clearly understood, whilst building codes incorporating seismic resistance design, especially in seismic prone areas, did not exist. This inevitably led to inefficient design and consequently to severe damages in many historic concrete buildings during past seismic events. This paper explores the use of novel Engineered (Fiber Reinforced) Cementitious Composites (ECCs), with strain hardening abilities in tension, for the repair and strengthening of old sub-standard reinforced concrete columns, focusing on their confining and shear strengthening potentials. The experimental results show that, when replacing the reinforcement cover with fiber reinforced ECCs, the fibers bridge tensile cracks, limiting their opening and increasing their resistance against volumetric expansion, ultimately leading to increased amounts of energy dissipation. ECCs may thus by used in the repair of historic concrete structural elements.

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Section: Introductionmentioning

confidence: 99%

“…Many investigations to understand the mechanical behavior of SFRC has been carried out by researchers [8][9][10][11][12]. The experimental works vary from testing the RC beams [8][9][10], RC beams with notched [11], and concrete cylinder and dog bone specimens [12]. The tensile stress-strain curve and tensile fracture energy from the SFRC specimen can be obtained explicitly from the dog-bone specimen tested under uniaxial tensile load.…”

Section: Introductionmentioning

confidence: 99%